Can you verify that these appear in ...\Documents\My Tableau Repository\Datasources? I have tested locally and can not reproduce the issue.
Ah! They were saving to the \Documents\My Tableau Repository\Datasources\10.0 So then I moved them into the folder en_US-US and it worked! Thank you for directing my attention to the file location.
Great to hear it Brisa.
Have a great weekend.